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Figure 1
Plots from POINTLESS of axial reflections for the P212121 example shown in Table 1[link]: (a) h00, (b) 0k0, (c) 00l. In each case I/σ(I) alternates between weak and strong for odd and even indices, respectively, indicating a 21 screw axis in each direction. With only three observations along the h00 axis, assignment of a screw along a is far less certain than along b and c (see Table 1[link]c). The plot of I′/σ(I) (almost the same in this case) uses a modified value of I, subtracting 2% of the neighbouring axial reflection to allow for possible contamination of weak reflections by a strong neighbour. All panels in Figs. 1–5 are monochrome versions of plots from LOGGRAPH essentially as they appear from ccp4i.

Journal logoBIOLOGICAL
CRYSTALLOGRAPHY
ISSN: 1399-0047
Volume 67| Part 4| March 2011| Pages 282-292
doi:10.1107/S090744491003982X
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